A two-alarm fire at a metal recycling plant in Redwood City this morning has been extinguished, according to the Redwood City Fire Department.
Although the smell of smoke and burning plastic was reported as far south as Mountain View, a fire marshal said.
The blaze at Sims Metal Management -- the second fire in as many months at 699 Seaport Blvd. -- started after the sound of a small explosion was reported by plant workers at about 12:50 a.m., Redwood City Fire Marshal Jim Palisi said.
The fire sparked in a stockpile of "light iron" recyclables, such as discarded appliances. Embers ignited a second smaller spot fire that was quickly extinguished, he said.
The primary blaze, which sent a large plume of smoke into the air, burned for more than eight hours before being controlled as of about 9:45 a.m., Marshal Palisi said.
No injuries were reported.
Officials advised any residents in the area who smell smoke to stay indoors with their doors and windows closed, though the advisory was only issued as a precaution, Marshal Palisi said.
Seaport Boulevard reopened at about 8 a.m. after shutting down for more than seven hours, although public access to the recycling facility remains closed.
On Nov. 10, a fire at the same facility burned in a pile of heavy recyclables and took more than seven hours to control.
Sims Metal Management issued a statement this morning about the fire:
"In coordination with public officials, Sims will thoroughly investigate what could have caused this explosion and fire, including sources of the material in the stockpile. No cause has yet been ruled out."
The company said the timing of the two fires a month apart "raises concerns" and said new policies were implemented after last month's blaze, including reducing stockpile sizes and separating light iron from auto bodies.
The previous fire on Nov. 10 ignited a heap of crushed cars and other large material, causing several agencies to issue shelter-in-place alerts to residents. Nobody was injured.
Marshal Palisi said of the Nov. 10 fire, "With any recycling center that breaks apart materials with machinery, there will be heat generated by friction."
"We'll never know the exact ignition source -- it's not like a building fire -- there's no definite area of ignition to pinpoint. But we know it wasn't natural, not arson and not deliberately set," he said.
Firefighters also battled a blaze at the same recycling center in April 2007 and the Bay Area Air Quality Management District issued a public nuisance violation due to the large quantities of contaminates that annoy or cause a nuisance to the public, according to BAAQMD spokesman Ralph Borrmann.